Twin Engineering in Solution-Synthesized Nonstoichiometric Cu5FeS4Icosahedral Nanoparticles for Enhanced Thermoelectric Performance

Aijuan Zhang, Bin Zhang, Wei Lu, Dandan Xie, Hongxia Ou, Xiaodong Han, Jiyan Dai, Xu Lu, Guang Han, Guoyu Wang, Xiaoyuan Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)

Abstract

A facile colloidal solution method has been developed for the fast, scalable synthesis of orthorhombic@cubic core–shell nonstoichiometric Cu 5FeS 4 icosahedral nanoparticles. Such nanoparticles contain high-density twin boundaries in the form of fivefold twins. Spark plasma sintering consolidates the nanoparticles into nanostructured pellets, which retain high-density twin boundaries and a tuned fraction of the secondary phase Fe-deficient cubic Cu 5FeS 4. As a result, the thermal and electrical transport properties are synergistically optimized, leading to an enhanced zT of ≈0.62 at 710 K, which is about 51% higher than that of single-phase Cu 5FeS 4. This study provides an energy-efficient approach to realize twin engineering in nonstoichiometric Cu 5FeS 4 nanomaterials for high-performance thermoelectrics.

Original languageEnglish
Article number1705117
JournalAdvanced Functional Materials
Volume28
Issue number10
DOIs
Publication statusPublished - 7 Mar 2018

Keywords

  • Cu FeS
  • icosahedron
  • nanomaterials
  • thermoelectrics
  • twin engineering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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